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Well, first, at least in the USA, I am sure it is accurate. Since it is illegal to mislabel food products. They could be shut down and face heavy fines. I don't think they would risk it. Plus the FDA has to inspect it.
Protein powder should not give you gas. If you take in more protein than you can digest, you will have to crap more though. So you could get more gas all at once that would have been spread out over a longer period because of the movement in the colon.
Also eggs, and meat for that matter, don't cause gas contrary to popular opinion. They DO, however contribute to the SMELL a great deal. The actual cause of most gas is the breakdown of carbs in the intestines.
For example when I am cutting, hardly ever fart, except when I have the sugar free candy with all the sugar alcohols. Or maybe certain veggies. It's because of how low the carbs are.
Then when I bulk... Oh man... do NOT stand behind me! It will ruin your day.

Wheat bread and beans are the worst. I take a little beno but I'm still rippin em pretty bad.
I would really think 3 scoops is more than most people can digest, unless you are very large. For most of us, 2 scoops at a time is good. It digests quick, so a little later you can take some more. So if you really want that much protein at once, have 2 scoops and something else that digests slower, like casein or a can of tuna.